Specifications:

Mount: 19mm Swing awayFilter trays: three rotatable 4x5.6

includes: French flag, sideburns, matte inlays.

ARRI MB-18

4"x5.65" Production Matte Box MB-18 is a flexible wide-angle studio Matte Box that can be used with primes and many zoom Lenses. It is a useful alternative to MB-14 when a smaller build is desired. MB-18 requires a studio bridge plate.
Filter Size: 4" x 4", 4" x 5.65", 4.5" round
Vertical and horizontal filter frames available
2 and 3 trays stage available
Swing away mechanism
French flag holder
Requires studio bridge plate, not for 15 mm lightweight support
Top / bottom and side flags included
Set of 6 masks included